Huh.
Personally, I don't find Lee or Zed OP. They're relatively balanced, if a bit annoying (sorry), but have plenty of counterplay. But I can see your point. In solo queue, some players think that hitting the keyboard with their face is how you win, while pros actually can reach their full potential hence you see them more in LCS.
I find Lee's pick rate in solo queue annoying, but that's it. As for Zed, it's people who complain about him that get on my nerves. He's annoying as hell, yes, but when someone complains about building against him is when I feel no pity. That's part of the game, and everyone has to do it (like picking Botrk over BT if you're against champions who benefit from building health).
Bit long, but that's my opinion. Sej needs a love tap, though, but I don't quite get the nerfs to her ult over her W.